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Old 03-16-2016, 03:52 PM
lsmalley's Avatar
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Location: California
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w201 MAS relay

Anyone know what the deal is when replacing one of these? My a/c quit working the other day and I checked the fuses and everything around, then I decided to swap out the MAS just to check to see if it was bad. So I took out the old one and out a known good one in and still no a/c. I checked the fuses again and I must have overlooked it because it was slightly dislodged. Adjusted it and now a/c is good again. I kept that MAS in and noticed that pulling off from a start was slightly slow. Not too noticeable, but then after a while there was a hiccup in the idling once the car was warmed up. So I decided to take that MAS out and put the other back in. I get the other one in and the car won't start. sorta like its starving for fuel even though I didn't tamper with anything. The MAS are the same exact part numbers.


Last edited by lsmalley; 03-16-2016 at 04:27 PM.
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Old 03-16-2016, 04:36 PM
lsmalley's Avatar
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Sorry guys, it was fuel starvation. I increased the fuel mixture and all is well.....I wonder how it got out of wack.

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